Observation of Spin Coulomb Drag in a Two-Dimensional Electron Gas

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An electron propagating through a solid carries spin angular momentum in addition to its mass and charge. Of late there has been considerable interest in developing electronic devices based on the transport of spin, which offer potential advantages in dissipation, size, and speed over charge-based devices. However, these advantages bring with them additional complexity. Because each electron carries a single, fixed value (-e) of charge, the electrical current carried by a gas of electrons is simply proportional to its total momentum. A fundamental consequence is that the charge current is not affected by interactions that conserve total momentum, notably collisions ... continued below

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Weber, C.P. August 19, 2011.

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An electron propagating through a solid carries spin angular momentum in addition to its mass and charge. Of late there has been considerable interest in developing electronic devices based on the transport of spin, which offer potential advantages in dissipation, size, and speed over charge-based devices. However, these advantages bring with them additional complexity. Because each electron carries a single, fixed value (-e) of charge, the electrical current carried by a gas of electrons is simply proportional to its total momentum. A fundamental consequence is that the charge current is not affected by interactions that conserve total momentum, notably collisions among the electrons themselves. In contrast, the electron's spin along a given spatial direction can take on two values, {+-} {h_bar}/2 (conventionally {up_arrow}, {down_arrow}), so that the spin current and momentum need not be proportional. Although the transport of spin polarization is not protected by momentum conservation, it has been widely assumed that, like the charge current, spin current is unaffected by electron-electron (e-e) interactions. Here we demonstrate experimentally not only that this assumption is invalid, but that over a broad range of temperature and electron density, the flow of spin polarization in a two-dimensional gas of electrons is controlled by the rate of e-e collisions.

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  • Journal Name: Submitted to Nature

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  • Report No.: SLAC-PUB-13990
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1022498
  • Archival Resource Key: ark:/67531/metadc834714

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  • August 19, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 30, 2016, 2:06 p.m.

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Weber, C.P. Observation of Spin Coulomb Drag in a Two-Dimensional Electron Gas, article, August 19, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc834714/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.